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The governor on the transmission is connected to the engine via a vacuum hose. If the governor fails the engine could draw transmission fluid into the combustion chamber causing a misfire. It should also be visible in the engine oil as without doubt some of it would wash past the rings into the sump.
Saw this exact thing on a V6 Granada a few years ago. Weirdly there was no smoke when running but the engine sump was filling up with good old dexron and the combustion chambers were immaculately clean!

That's good news. Now, is your EGR vacuum operated or one of electronic ones? Either way disconnect it remembering to plug the vacuum line to avoid a vacuum leak and try again.
An electronic one might set a code and the SES lamp on its own but you can still
Drive it to see if you get a misfire.

I have checked the auto box fluid level and it is as it should . Colour is good. I have really been stuck for time. I manage a big band for my sins, and the guy whose band it is has been diagnosed with Dementia .His remaining family live in Scotland and he has no friends to speak of, so , I am his temporary carer until proper care is in place. Fed up with filling in forms for him and hospital appointments. There is a tiny light at the end of the tunnel which I hope will get bigger quickly. Cosworth has only been out once since last September. and Corvette hasn't been touched for a month or more. Roll on next spring, if I am not in need of care myself!!!!!.

and the guy whose band it is has been diagnosed with Dementia .His remaining family live in Scotland and he has no friends to speak of, so , I am his temporary carer until proper care is in place. Fed up with filling in forms for him and hospital appointments. There is a tiny light at the end of the tunnel which I hope will get bigger quickly.

I know what you mean, there is a lot of paperwork. It is a difficult one. Hope all goes well and that care will be sorted shortly.

Hi guys, my situation is still much the same with the old guy I am helping. I did strip out the digital dash to try and locate the ALDL. Still no luck. I have stripped out the panels under the dash and still can't find it. Is it possible to read the fault codes elsewhere in the wiring harness?. Is there a mechanic out there who could sort the problem for me?. I would be willing to pay to get this bloody car sorted and running again. I am away from the 24th September probably for a couple of weeks. If someone could sort, they would need to come to my house in Waterlooville as I don't think the car would run any distance.

I wouldn't know where to start on a C4, the only guy i know is Dennis Tomlinson, he has a C4, and owned it for many years, he has also fixed many cars over the years. Next time I see him I'll have a word, and try to get his phone number.

The TPI's are very straight forward. Approaching it logically will probably resolve the issue but what's making this one difficult to diagnose is the length of time between the updates. I'm not sure what's been checked and what hasn't.
Unfortunately that's the difficulty with the extremely remote diagnosis and whatever time John is able to Devote to it.
Nobody's fault , just tough to do. John is right, it would be easier for someone to go to him. I wish I could help but distance and time are not on my side either! Happy to continue to make suggestions though.

Have you checked under the center console ashtray? Some models had the ALDL connection there and not above the drivers right knee.

That is worth a look!!! The ALDI is not above the drivers Knee. I find it hard to believe that it has been removed as that would be more trouble than it is worth to do with little point in doing it. I will have a look. Thanks.